<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>App</title>
</head>
<body>
    <h1>Hello,welcome!</h1>
    <p><a href="{% url 'myapp:f1'  %}">f1</a></p>
    <p><a href="{% url 'myapp:f2' '1' '2' %}">f2</a></p>
    <p><a href="{% url 'myapp:f3' string='pos-2' %}">f3</a></p> 
    <p><a href="{% url 'myapp:f4'  %}">f4</a></p>
</body>
</html>